//
//  DYCNavigationViewController.m
//  DYCBaisi
//
//  Created by Yachao on 17/6/29.
//  Copyright © 2017年 Yachao. All rights reserved.
//

#import "DYCNavigationViewController.h"

@interface DYCNavigationViewController ()<UIGestureRecognizerDelegate>

@end

@implementation DYCNavigationViewController

+ (void)load{
    UINavigationBar *navBar = [UINavigationBar appearanceWhenContainedInInstancesOfClasses:@[self]];
    // 只要是通过模型设置,都是通过富文本设置
    // 设置导航条标题 => UINavigationBar
    NSMutableDictionary *attrs = [NSMutableDictionary dictionary];
    attrs[NSFontAttributeName] = [UIFont systemFontOfSize:20];
    [navBar setTitleTextAttributes:attrs];
    
    // 设置导航条背景图片
    [navBar setBackgroundImage:[UIImage imageNamed:@"navigationbarBackgroundWhite"] forBarMetrics:(UIBarMetricsDefault)];
    

}

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{
    // 恢复滑动返回功能 -> 分析:把系统的返回按钮覆盖 -> 1.手势失效(1.手势被清空 2.可能手势代理做了一些事情,导致手势失效)
    
    if (self.childViewControllers.count > 0) {
        viewController.hidesBottomBarWhenPushed = YES;
        // 设置返回按钮,只有非根控制器
        viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem backItemWithimage:[UIImage imageNamed:@"navigationButtonReturnN"] highImage:[UIImage imageNamed:@"navigationButtonReturnClickN"] target:self action:@selector(back) title:@"返回"];
    }
    // 真正在跳转
    [super pushViewController:viewController animated:animated];
}

- (void)back{
    [self popViewControllerAnimated:YES];
}

- (void)viewDidLoad {
    [super viewDidLoad];

    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self.interactivePopGestureRecognizer.delegate action:@selector(handleNavigationTransition:)];
    [self.view addGestureRecognizer:pan];
    // 控制手势什么时候触发,只有非根控制器才需要触发手势
    pan.delegate = self;
    
    // 禁止之前手势
    self.interactivePopGestureRecognizer.enabled = NO;
    // 假死状态:程序还在运行,但是界面死了.
    
    /*
     为什么导航控制器的手势不是全屏滑动 =>
     */
}

- (void)handleNavigationTransition:(UIPanGestureRecognizer *)handle{
    
}

// <_UINavigationInteractiveTransition: 0x7f9c948302a0>:手势代理

/*
 <UIScreenEdgePanGestureRecognizer: 0x7fdc4a740120; state = Possible; delaysTouchesBegan = YES; view = <UILayoutContainerView 0x7fdc4a73e690>; target= <(action=handleNavigationTransition:, target=<_UINavigationInteractiveTransition 0x7fdc4a740440>)>>
 
 */

#pragma mark - UIGestureRecognizerDelegate
// 决定是否触发手势
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
    return self.childViewControllers.count > 1;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end
